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11A-34 IMMOBILIZER SYSTEM (C24SE, 4JA1-T) B0001 REPLACE ELECTRONIC CONTROL UNIT (ECU) (IMMOBILIZER FAULT) Step Action Value(s) Yes No 1 Was the "Immobilizer System Check" performed? Go to Step 2 Go to Immobilizer System Check 2 Recheck the DTC. 1. Key position is “OFF”. 2. Install the scan tool on vehicle. 3. Key position is “ON”. 4. Check the DTC on scan tool. Is DTC B0001 stored? Go to Step 3 Refer to Diagnostic Aids 3 Check the immobilizer control unit (ICU) circuit. 1. Ignition "OFF," disconnect the ICU. 2. Check the ICU circuit for an open, short to ground, or short to voltage. Also, check the ICU ignition feed circuit for an open or Was a problem found? Go to Step 4 Go to Step 5 4 Repair or replace the immobilizer unit (ICU) circuit. Was the action complete? Verify repair 5 Replace the immobilizer control unit (ICU). IMPORTANT: The replacement ICU must be Was the action complete? Verify repair
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